What does php instantiation mean?

php Instantiation refers to the process of creating objects using classes in object-oriented programming. It is the process of converting an abstract concept class into a physical object of the class. During the instantiation process Generally composed of [class name object name = new class name (parameter 1, parameter 2...parameter n)].

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Instantiation refers to the use of The process of creating objects from a class is called instantiation. It is the process of converting an abstract concept into a concrete object. The instantiation process generally consists of class name object name = new class name (parameter 1, parameter 2...parameter n).

Take PHP as an example.

Classes are different from functions. They cannot be used directly after being defined, because a class is just an abstract concept and needs to be instantiated through the keyword new before it can be used. The syntax format of class instantiation is as follows: variable name = new class name ([constructor]). Among them, the variable name can be the name of any PHP variable, and the construction parameters depend on the constructor of the class (will be described in detail in Section 8.2.5). If there is no constructor, the parentheses will be empty.

You can use a class after instantiating it.

For example:

<?php
     class People{
         public $name;  
         public function introduceMySelf(){
             echo &#39;内容&#39;，$this->name.‘内容2’;
         }
      }
      $p=new People();
 ?>

If you want to use the attributes and methods of a class outside the class (provided that the attribute or method is accessible), you need to use the operator ->, the syntax format is as follows ：

The instantiated class variable name->attribute name;

The instantiated class variable name->method name ([method parameter]);

Use Class methods are the same as calling functions. Function parameters are given in parentheses (of course there is no need to write them if there are no parameters). It is important to note that when using the operator -> to reference attributes, the attribute name does not include the $ symbol.

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